UNPAID modders don't have entire design teams to work with, or hordes of beta testers to torture.
I shall just keep this related to the RTR mod. I believe that it is currently one of the most succesfull mods. There are alot of posters who contribute to the mod. If the maker of the mod would accept them as a member of a RTR team he would have a pretty large design team.

Recently he decided to release the 4.0 version. If he hadn't tested anything what would be the problem with saying that it is still a beta and it needed testing? There would be enough players to sort out the bugs within week and release the final version without bugs. Instead he apparently released it with the thought "I will fix it later". Players will download it and then after spending alot of hours in the campaign, the game crashes. He's no modder, so perhaps no idea why it happened and he is forced to abaondon his campaign. Is that what a modder should be proud of? Or should he be proud about delivering a finished and polished product that has been created and tested by an entire community?

It seems to me that you have the opinion that the only thing that should motivate programmers to deliver a bugfree product is pay. I can only hope that the CA employees feel a bit of love for their baby and care for the customers who will play it.