@Aashenfox @XComanceX - the other thread is now closed, but to to clarify, it wasn't a serious suggestion, its just something i throw out from time to time when people start arguing for bonuses in Open.
Overall winging up in open (and PG) though does generally make the game more profitable and easier - you've got wing bonuses (eg: trade), you've got wing missions that can bring in more money for less effort, and combat zones and high threat missions become a walk in the park. So from that aspect open is a lot easier in a wing, plus the threat of random ganks is greatly reduced, since gankers tend to prefer solo targets and tend to operate solo.
Basically there are pros and cons in all modes and overall, i think it balances out. The risk of PvP is generally quite low except at certain locations and during events - and keep in mind,
@XComanceX said nothing about bonuses only while doing CGs or similar, it was described as an always on bonus, to encourage open play in general, meaning, depending on your location of course, most of the time the "risk" of playing open isn't really a risk at all - its a bonus for no real reason, except, as described, to bribe people into playing open.
As always, who needs more people playing in open? Those already playing in open and are somehow, for their particular reasons, want to see more players. The people playing in PG/solo are happy where they are.
Keep in mind, according to FD, open is already the most popular mode, and instancing limits the number of people you can see at once anyway, so at events, its not like you'll see many more people, and outside events, the galaxy is a big place, if open got a bonus, can easily relocate to a system where PvPers almost never go, so why should one get a bonus?
There's also a number of good reasons any player, even an open only advocate, might want to jump into PG/solo, at least temporarily - congestion at stations is one. The proposed system of increasing bonus for staying in open could be wiped out due to a need to switch modes because the current station you are at has clogged up with ships in the mail slot and relogging just throws you back in the same instance.
I've also been in groups with hardcode open only advocates who were using PGs to farm materials - yes, open only advocates do use PG and solo, when it suits their needs.