If it's behind a 'paywall' then a few of the exploits mentioned (such as the above Commodity CG ine) can be effectively negated.
The only way you can stop people from doing such things is to make it cost ineffective.
Cost for a lot of players is irrelevant, credits are not hard to come by so ironically putting it behind a significant paywall affects newer/more casual players more than the established players who are more likely to use this as an exploit.
I'm a little disheartened at the number of threads that have popped up that are along the lines of "Everyone is whining about immersion but there's no real impact of instant ship transfers", but there are. For instance:
• PowerPlay fortification/prep runs will be sped up by 30% which affects the entire balance of PowerPlay (powers will be able to fortify more systems). Cost has very little impact on the heavy haulers in PowerPlay and currently actions in PowerPlay are often time-gated to try and achieve balance - this short circuits part of that balance (I've explained in detail how elsewhere). This also affects the heavy haulers in CGs.
• Allied to the above, Undermining in hostile space becomes significantly easier because distant systems can be reached with few jumps (less chance of being seen/interdicted) but you can still have a capable combat vessel when you arrive.
• Ship balance will change markedly and multirole ships will lose their value. I currently have a battle equipped Anaconda I use most of the time as it can still haul a bit of cargo and has good jump range. That ship becomes far less valuable after this change as I can fly an Asp everywhere and call in my FdL - I won't need to fly my Anaconda to do undermining/CZs etc., I can taxi there then call in a significantly more ideal ship for fighting. As a lot of the parts of the game I play are directly competitive (PP for example) then simply being told "don't use it then" isn't really an option. I think losing a whole factor of ship balance is detrimental to the game.
• PvE becomes easier. If you've always got the "perfect" combat ship available then there's no question of "that looks like a good mission, can I manage that in this ship with the weapons it's got?" it just becomes, I'll do that, now which of my ships is ideal for that mission. With PvP there'll be less build compromise and if players are able to fit an absolutely minimal FSD and use engineering modules to improve boot time rather than range then it's significantly easier to HW out mid-fight if things get a bit too sticky.
• If more people are zipping around in Asps with 50ly jump ranges there's less chance of chance encounters so interactions are concentrated in the "event" systems. I think that's a shame as I've often bumped into people in random systems (and not in a hostile way - I rarely PvP to be honest)
• I think there's a real underestimation of how much this will affect how big the galaxy feels - especially as most people play within the bubble.
Now that doesn't mean I don't think we should have ship transfers, I think we should, I just think that they should have a time delay for a few reasons:
• It removes at least three or four of the issues above, the PowerPlay/CG short-tripping becomes irrelevant even with a short distance based delay (5 minutes for 100ly transfer would stop that approach being any quicker).
• There is still a benefit to multi-role ships as you can react quicker and it still means players have to make a choice (do I get there now or do I wait for my combat ship).
• A time delay affects all players equally. A cost, even a high cost and a scaled cost on ship value, really won't affect the billionaires in the game.
• It removes the uncomfortable issues people have with lore/immersion.
• It allows a potentially more "living" feel to the game in the future - they may not have time to add this now but with delayed ship transport then we could have the option of seeing huge bulk carriers arrive at stations and drop off your ship - there may also be gameplay elements around those bulk carriers. For instance how about a pirate group approaches you, they've nicked the shipyards transponder beacon and a bulk carrier is going to drop away from the station, where you could possibly "liberate" the brand new top of the line FdL it's carrying...". Or how about you're hired as a fighter escort for a bulk carrier.