As a proxy voting for this worker, I do fully understand the concerns raised by @dexy - I came to ask myself the very same questions.
My conclusions is that this is the cost for an **independent** development team. If we (the BTS community) wanted this cheaper, we'd
need to hire a company to work on this. Developers in that company would earn less (probabably about 60-80$/hr) and will be managed
by the company. But then, don't expect that this company will invoice only the rates of those developers. That's not how a software
house can survive for long, profits need to be made for the company too, hence, you are looking at a rate that is at least as high as
current core devs'. And even if you found a company that was willing to contribute for less, I still prefer to have our own team that's
knowledgable trusted and loyal to the BitShares community. Totally fine with paying for that.