Having bought, enjoyed and subsequently sold a few "non standard" boats in recent years (and again currently owning another) I can tell you that we were able to sell them without great difficulty.
The key is to buy quality and do the upkeep to keep them looking great and in good condition all round. A discriminating and knowledgeable buyer will see past the "no name" and recognize quality.
You can generally buy such boats at a considerable discount, so your reselling price can reflect your reduced initial investment too. So you end up with a) a solid boat in a market of questionable "brand names", b) at a price that is usually more attractive than the asking for the "Brands" in poorer condition.
We owned a Choate 40 for 12 years, not exactly a household production boat. Upgraded and maintained it well, and sold for very close to our initial purchase price 12 yrs earlier. While this does not include running costs and upgrades, it's still not bad and we had 12 great years with her.
If she surveys well and you like how she looks/handles, go for it!