Because if you vote Yes they gain a considerable amount. Sure, you will gain a little now. But that will not offset what they will do to you later.
Why the propaganda to sell you a Yes vote? Because even they know it's not worthy of a Yes vote on paper alone.... They have to hard sell you the reasons by conveniently only highlighting the gains.... But glossing over the pains. As well as throw in the empty promises of bases, part time rosters, w-patterns all on a proviso of course that will never come to reality.
Who reads the fine print....? Ask anyone who bought a boat in DB... Sorry to tie this in, but it's a very real example of how only focusing on the good leaves you dangerously exposed. Condolences to those affected.
Simply it's not right.
They want you to vote Yes.
Do you need any other reason to vote No.