Yes, I get that the Vulture is an exceptional ship, and I was perhaps wrong to say the python was the 'next ship' up in terms of overall ability.
My point comes down to giving combat focused players something to strive for in between the 20mill fully kitted ship mark and the 130mil fully kitted ship mark. As I said, I love my vulture, but in games, you're always looking for something 'new' and that is generally something that people want to achieve in a game. It keeps them interested and working towards your 'next ship' is something that keeps people playing even when they've probably hit the boredom threshold. If the stretch to something new / better is a few weeks of 'grind' people will probably eek it out. If the stretch to something new is many months of grind (especially if it's repetitive), they're more likely to drift away from the game which in turn hurts the game.
I have been in my vulture for months. I have 13mil in the bank. (I made that by grinding RES which was fun at first, but now feels like a chore. Bores the hell out of me!) I know that even if I made the 51mil to get the stock FDL, I'm still going to need to grind around another 80mil for upgrades before it's competitive. The grind to 51 mil in its self is going to be repetitive and sap my motivation. FAS, clipper and other rank based ships require even more repetitive grinds.
Again, I'm not saying rank ships are bad. I totally agree that there should be ships that require extra special commitments, but I think we need something at around the 50-60mil (fully kitted out) so players don't 'burn out' before they get something new and shinny to keep them interested in the game.
It's like any game. If the grind to something new and shinny is too long, then a percentage of players will drift away (bad for the overall game). If the grind to something new and shinny is moderately progressional and achievable, players will get the fix the need followed by the motivation to grind to the next new and shinny thing which in turn will keep them playing (good for the game).
I'm not saying the cost of the next tier ships should be lowered, only that there needs to be something in between that is seen by those currently in the vulture tier as an achievable milestone, albeit by putting in a little effort.