Here's what I see as potentially the most monetizable MAS90/200 services - in order of what I think could be their popularity and potential to be recurring money makers:
Did I miss any? I put Support/Upgrades/Break Fix at the bottom as I view them as required by any customer in order to obtain other services. In other words in the future I don't see providing ad-hoc consulting for people not on our plan as being a way to grow business (keep busy - yes -- grow - probably not).
Scripting
SQL Upgrade
BizNet or SMI
Crystal Reporting
KnowledgeSync
Sage Payments
Support/Upgrades/Break Fix