Bob,
I have been on both sides of the fence and the answer to your question is quite simple. YOUR budget holder is responsible for paying for YOUR accommodation and if THEY choose not to fund Hotac for you, even though you are entitled to it you really can't blame the AT crews.
I could regale you with all sorts of tales with regards to my 10 years with SH where some chiseler who in his/her desperate attempts to get promoted simply tightened the purse strings but that would be bleating. The nice thing about the AT fleet is that there is some common sense out there, there is funding for what we are ENTITLED to and apart from the 2 sand pits life is pretty bearable when away.
The fact that the FJ/SH folk are treated so poorly is down to your OWN managers and you should not crticise the AT folk for having their sh1t in a sock so to speak.