First, I would like to thank ADMIN for all the work he has put into this forum.
Regarding keeping or deleting old content, I think it would be a mistake to delete anything. I first found this forum in 2008 while searching the web for information about some ancient LASERWORKS galvos. I have read most of the forum posts to "learn" about the hobby and in the process got a feel for who's responses/comments/opinions have the respect of the forum members...good insight when asking for help and filtering through responses, etc. There are so many ways the old info can benefit someone else. One many occasions I have searched for something, found an old related post and was able to contact the OP and get info I could never have found otherwise.
As for the $ contributions, I was contributing monthly for a few years but had to stop for bank account reasons - my Paypal is tied to an account that I only use for PP and don't regularly deposit funds into, which caused problems. As many others have already mentioned, if a method is added to make one time donations (ie not recurring) I could contribute larger amounts as/when needed without worrying about the monthly balance in my Paypal account.
Just my thoughts.