The pay won't be low. All the airlines in Singapore pays pretty much the same just like the airlines in the Middle East.
By flying 80 hours a month Captains at Jetstarasia, Tiger, Silk, even the mainline SQ get about similar pay. The only differences would be the longevity in the company might make one salary higher in the mainline SIA. It will be local terms without any allowances.
Hope that helps.