Nothing is really too expensive if it is capital expenditure for a business and can repay cost over time, it is also not really expensive when you think what a woman can pay for clothes, shoes and bags that deliver a functionality that can easily be matched in quality by a lower cost item just not with a rip off "designer" label. The reason these niche tools are expensive is that they are niche and there is no competition so captive audience and that was the manufacturers intention, you want one then pay up.
But In reality what does a Domino do that a simple biscuit jointer doesn't do for 95% of the times it is used?
(for the record I would love a Domino! haha)