It is a fair question, and I am not particularly hard over on the issue, nor especially well versed in the argument. Three things spring to mind, let me run them up the flag pole:
1. The majority of the high paying jobs you are referring to are in the corporate/private sector. I think it is one thing to enter into voluntary contract with an employer in which they pay you hefty salary in exchange for standards of conduct of all types, and quite another to cede to the State yet another power over personal privacy and actions for an ever widening sector of the populace.
2. Food stamps versus a high paying job? No contest. Lots and lots and lots of people would trade the first in favor of the second.
3. Given that these programs dramatically impact the children of the poor to an even greater degree than the adults, are you not simply stigmatizing poverty rather than merely government assistance?