There is always room for good folks providing this service. I've done business with a number of excellent ones over the years. The main problem is the work load for refinishing services is highly variable depending on the economy, time of year and other factors beyond one's control. If you keep it as a second job generating money you don't rely on, it is a good business model. If you come to rely on it, as one of my friends did, inevitably something will come along to cause a blip in demand or your ability to maintain the pace and a downward spiral starts. Figure out what you can do for a price and stick to it. Don't take on more than you can do with a smile and for gosh sakes, don't plan your life style around the extra income. Also, at a small scale, this is a word of mouth service highly reliant on repeat business and recommendations. A web site with lots of before and after pics of your work is the best way to generate new leads. Keep in mind that many folks will want to send you a complete firearm....for which you will need a Gunsmithing FFL at a minimum in order to send/receive.....and if you go the route of touching complete firearms (vice just the wood) liability insurance will be a must since if anything goes wrong with a firearm after you've touched it leaves you exposed.....whether you had anything to do with the problem or not.