No doubt. There's a substantial cost involved with creating a proper atmosphere for both the instruments and the humans involved. Depending on what you shoot, you can get into some very real costs, or you can limit your availability. or both. That's why I've been saying for years that Warmoth's finishes are a bargain. You can get AAAAA grade poly for less than what most would charge for lacquer, and you can get it any time you want, and in both cases both for less than any "boutique" shooter will charge. The only reason to do it yourself is if you want something they just won't offer, or if you somehow end up with an unfinished body. Maybe you built it yourself, or bought it that way from somebody who finally figured out they made a mistake.
You can shoot lacquer yourself fairly easily and get excellent results, but it's a lotta work by the time you're done. You can do the oil thing, but that's an obvious home finish from a mile away and it won't last long. Or, you can spend a jillion dollars on a proper booth and shoot poly, which is relatively easy if you've got the talent and the capital to get into it. Long story short, unless you're going to do a lot of finishing, it's best to stay out that activity if you can. Always better to let the guys who are committed to it do it.
Ambient temperature, humidity and ventilation are critical, no matter what you do. Getting those things right is usually not easy.