I'm Fillip, co-Founder and Lead Programmer for DBTech
This absolutely is the correct forum for this thread, and I'll handle what I can answer and ensure other people are made aware of things I can't answer so that they can get back to you ASAP
Additionally, some mods may not be able to preserve their data if core functionality has changed or the data storage method has been updated. The only known and foreseeable example of this is vBShout, in which I took the vB5 version as an opportunity to correct a design flaw (hey, I was young once ) that plagues me to this day but cannot be resolved without making upgrades impossible.
However, we'd never dream of doing this with mods like APTL or vBArcade, where your data is of the utmost importance. I don't believe the same can be said for shoutbox shouts
While I don't know for certain, considering both vBCredits and vBArcade were written by the same person ( @Darkwaltz4 ) I'd be shocked if there were no integration between the two.
If by money you mean real money via ads: @Darkwaltz4 will let you know for sure but I believe the arcade works in conjunction with any profit-sharing accounts you have with the sites distributing the games, yes.
With our first 2 products we used to have this weird system where Lite and Pro were separate mods - worked in theory, but was a pain in the arse for people to deal with, so I had to toss that system
Decado to answer, I personally don't know anything about their hosting services, only their vB SEO service
Let me know if you have any further questions