Stay or Not to Stay?

I am currently the sr. technician (I used to be the owner) in a small town computer store, don’t see much in the way of raises, perks, etc.. – no health insurance, – that said – It does have it’s benefits.. I pretty much run the place, and I have the freedom to do come and go as I please as long as I get my work in check – I have been at this for over a decade. Now.. I am in the process of getting an MCSE 2003, and I have a job offer that should give me twice what I make now, plus benefits. Sounds like a no brainer – right? – What about the freedom to come and go.. isn’t this a valid arguement? I guess I have the jitters about it all.. The worst part.. I have to decide in the next day or so.