I'd go so far as to suggest an icon on the top level page. I can't think of a faster turnoff for me than having to pay, or playing on a game where RL money buys IC incentives. There's too many high-quality free games out there to bother with that, IMHO.
In most cases, "pay for incentives" ends up being de facto pay-to-play, so I agree they should share the "$" symbol. Ditto for places that only let you play to a certain level, enter certain areas, etc. if you fork over cash.
I have no problem with donations, so long as they are optional and don't influence the game's workings.
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