Loyal and good gang members are hard to find nowadays. If gangs wishes to resort to such immoral ways of running their gang, theyll be distrusted and everyone will start talking bad about them. Their consequences and effectiveness in basing will reflect this.
What you are bringing out seems more like the problem that forting used to have. Similarly, this problem is also similar to scams.
Why not just advise potentional donors to actually gain the trust of the gang leadership; vice versa before making a donation? I mean, the right to donate is up to them - If they don't wish to chip in, they can always join a "sub gang" that does not need these benefits, or simply give their space off to someone who will. Ultimately, it's to help the gang reach their goals.
There are many games with a solid core team with ranked members and stuff and these members can be the ones donating the most should their gang require. Another way to help increase gang fund is by having a portion of the money from bases go into it.
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