For sure, they hire people part-time quite often, so its just set up as a part time job.
Not too worried about them turning around and screwing me over, because we both know I'm the one holding all the cards. I trust them to look after me and treat me right, which is why I turned down the higher offer. If they betray that trust, there's nothing stopping me leaving. Didn't burn any bridges with the 2nd company, they're happy to have me back if it doesn't work out.