So which one is it OP?
If it's a prepaid shop like SBM, then yes there is a (small) issue here. Ask the ML to speak to the manager and sort out from there. If it's NOT a prepaid shop then see below covering your points:
1. Even though it's a "shop of that nature" the MLs are only obliged to give you a massage. They aren't legally bound to do anything else for you. Now it IS odd that they went ahead and jerked you off without telling you it's extra, I've never had that experience tbh UNLESS I've paid up front so it's bleeding obvious. They always ask if I want something extra whether its here or when I went overseas for a bucks stint.
2. 50 is standard for a NHJ. If the N part of that wasn't on play well, okay request it next time. If the girl is a regular and likes you a lot you could get away with stuff on top for this amount, but it's the standard, which leads straight into 3rd point....
3. $50 is the standard base tip for any sexual activity to occur at a massage place "of that nature" and while I haven't been at it for as long as some, 50 has been standard for quite some time I think. As others have said, if that's not within your budget, yet your paying probably about that much per month for internet access I presume,
www.pornhub.com and some tissues should suit your budget.
Hope this helps your next endeavour.
This is why theres a lot of talk of "pineapples" on the forum. Why pineapples? Yellow of course correlating to the Oz 50.