Indeed, small individual donations are not possible anymore. What is suggested is that if a group of players decides they want to donate, they must pool their money and give it in the amounts asked for on this page. We do not recommend players giving money to anyone they do not know. We realize that some players enjoy donating to the server and can only do so in small amounts and may feel like this change is bad. We feel that the pros of transparency outweigh the negatives.
As we've stated many times before, the Nostalrius team makes no money and we are not working on this project to profit financially in anyway. Much the opposite, we had provided ourselves for the server through both finances and opportunity cost in the time we've given to the server. This change in how we operate is to be 100% transparent and be perfectly clear about what donations will do.