As far as increasing incentives for beta, we've been down this. The only thing at this point that increasing non-objective based rewards will do is make the current beta-dwelling corps even richer; it will do little to incentivize others to use the islands, because it's not 'reward' that's stopping them as was pointed out, it's just too much risk.
I didn't mean to frame it as increasing Beta incentives. If Alpha is kept small and crowded, then it actually matters much less whether Beta gets any explicit (i.e. coded in) advantages. That fact that you'd always be squeezing in between other players to farm or mine on Alpha, with no chance to forcibly push them elsewhere, would stand more as a matter of differentiation than an incentive one way or the other. Then you're always fighting with other players for resources no matter where you are. The question is only whether its a passive or active aggression.