the younger girls here are mostly for their tuitions. International students pay three to four time more tuition fee than local students. Plus, they can only work 20 hr per week legally. Considering the high tuition and living expense in GTA and Van, the gals have no choice but to work beyond their capacity during their short school breaks.
Some elder ones (30ish) are mostly here with a visitor visa for some quick $$$.
Only few of the Korean gals are PR.
I always give more tips to the students as long as their service are OK. For the rest I only give big tips if they are at Steven's level.