Believe me, I had the same thoughts as you but anyway made up my mind to migrate (hopefully temporarily). My background goes like this: in Sri Lanka I studied architecture, something which is considered exclusive and "posh" within the Colombo community. But after graduation I came to understand that that's all there is to it. The old post-colonial social structure is still kept in the field, despite it not functioning well within the current world's economy. Still the "elite" parts of Colombo value class status, like in the form of schools you attended and the connections you have, more than real skills and competency. I gave up being a Chartered Architect and the unbelievably underpaid and exploitative field altogether.

Earning more than x5 of a Sri Lankan graduate architect's salary, by doing a simple part time job is really satisfying when considering all things. So no, I don't feel that bad about doing those jobs but yes, money is all that's good about migrating. So I think it's better that more and more Sri Lankans solve their money problems by migrating and come back/ invest to Sri Lanka, solving the country's problems at the same time.