"Fair" is such a relative term. Fair to whom?
It is pretty well established that guys who use the tools to make money are not particularly "price sensitive". This is because the improved performance makes money, so the cost will come back to you over time, then become profitable after that. Then there is the 3 year warranty, this is not voided if you use them in a commercial fashion. That is their intended market.
Of course you could lie or withhold the truth, but with most of the other tool brands, if they knew you were using them in that way, you might not see it work out so well. Some even say so in a disclaimer.
"Fair" also applies to the people who make and sell those tools too. Don't they deserve to make a Dollar, Euro, Pound, whatever, too?
I have always wondered where the margins were, in this case. Whether all of the money went to the manufacturer (and the employees) or if the "wholesale" price to the dealers left some meat on the bone for them as the retailer?
I use mine for my living, so I am probably at least somewhat biased, but I would be in quite a pickle without the tools that I have become dependent upon. The DF500, TS55, RO sanders, and the MFT system are invaluable to my work. The other products that I have acquired along with them have integrated so well as part of the system, that it just makes sense.
I do have tools from other brands. As a surprise to some, they are things that Festool offers too, in some cases.
I have "extra" routers, a Dewalt mitersaw, and my drills/impacts are Makita.