Hey.
This all depends on what you're referring to when you say "Vector Business"? Are we talking logos here? Where are you planning on working? Are you planning on making a living doing this? The internet is very competitive and requires daily hustle and bustle. You do a lot of work that may or may not be accepted. You may do fantastic work only to be under bid by someone else.
This would be a hard call since we have not seen much of your work. Vector drawing is fairly simple and most anyone with moderate Ps/Ai knowledge can create them. Remember, you are not the only one who can draw and turn the drawings into vectors. You're also not even close to being the best at it. (note: this statement is based on the fact that no matter how good you think you are, there will ALWAYS be someone better!)
Again.......depends on what you're referring to when you say "Vector Business". There are literally hundreds of thousands of people out there creating vectors. In some countries, many people are running cracked versions of Ps and Ai and selling vector work for next to nothing. The adobe line of software is highly affordable and readily available to just about any one. YouTube and all of it's instructional tutorials have made it easy for just about anyone to learn the software. What once was reserved for a few, is now open and available to all! I don't recommend quitting your day job. Hopefully, vector work will provide you with some beer money.
If your looking to be competitive in a hugely saturated market, then you need to shine brightly and stand out. I personally feel that if you're limiting yourself to just one category, then you would be missing out on the rest of the available market. The only people that I know that are making serious money with Ps, Ai, Id, and Ae, are all working for local design companies or just companies in the design department. I have had friends with exceptional Adobe software skills who tried their hand at internet (freelance) work and are now working regular day jobs in order to make ends meet.
I hate to sound so negative, but it depends on you, your determination and drive, your marketing and networking skills, your Ps, Ai, Id, Ae, skills, and how much time and money you have to devote getting your work out and promoting yourself. Another factor here in the US would be dependent on whether or not you have a degree. It's not imperative, but some companies may not even consider hiring someone without a degree on their resume no matter how good the work is.
Again, I hate sounding so negative..............I think I try to be more on the realistic side of the matter. It's way more competitive than you can imagine and requires a huge amount of hard work for little pay. On the more positive side, if you ever make a name for yourself and get your foot in the door with a big firm, the earning potential is awesome and far less work. The firm will do all the legwork!