The sponsor must abide by the rules/procedures implemented by POEA so as to avoid problems later on. The reason behind why some of them refused to follow the rules because they want to take advantage of the worker's benefits. Aside from that, they don't want to pay agency fees which will cost them thousand of rials. If you are planning to exit from singapore or hongkong going to qatar think twice before you do it. I'm pretty sure the singaporean/hongkong authorities will not allow you to exit without qatar visa stamp on your passport. The policies of Phil government are already spread across asian countries, beware... just to avoid unnecessary expenses and stressful situation.

Goodluck!