[shasarak]

I'm not sure one can express that in a compact way, as there are too many variables. You'd have to add some extra words, I think. Something like:

[ ] Neither payment nor donations are accepted.

[ ] Optional payment and/or donations are accepted, but there are no consequences in-game.

[ ] Optional payment and/or donations are accepted and have consequences in-game; ALL of those consequences can also be achieved by in-game methods.

[ ] Optional payment and/or donations are accepted and have consequences in-game; at least some of those consequences can ONLY be achieved by payment and/or donations.

[ ] Payment and/or donations are required to play.

Btw, I am not a MUD admin, but, as a player, I strongly favour a four- or five-option system over the status quo. Ideally I would like to have the extra detail of the 5-option system, and the difference between "pay to advance faster" and "pay to advance at all" matters a great deal to me (certainly far more than the difference between "no donations accepted" and "donations accepted but no in-game results"); but I'm concerned that the distinction between results being obtainable in-game and results not being obtainable in-game is too ambiguous. The 4-option is absolutely objective and unambiguous. The 5-option system potentially is not.