Thanks for your clear answer! :)
I don't know about the price, but between 60 and 110 euro/dollar for a lifetime license could be a good compromise between your need for programmer funds and the limited means of certain users and also the limited size of chats even if saved (see bugs below). Fyi: I just purchased a short time licence today to test the PRO features and I like it! But I am a little bit uncomfortable knowing that there is automatic bank withdrawal each end of cycle. So, yes a lifetime license could be great (as long as there is no kind of Pro + version in the future) :p
TWO BUGS:
1. The dialogue generation can sometimes stop (especially on long sentences), it's not a really big deal because you just have to try again but it's annoying.
2. Sometimes during a totally normal conversation (long but not always), the character start rambling by mixing verbs and words from some old (or not) messages. IE: "Oh no, maybe it's then yes I said it I said, said it!, but now we are here to, i can it! I think it's alright too!" or unfinished smaller strange one like "(giggling*". After some verifications, it look like it's a problem with exceded tokens limitation. It could be great to have the possibility to set it to 16384 or even 32768, because conversation are short (even with 8192 size). :/