Let me provide you with some perspective...
We've been pushing along on our own for 6 years now... We've done all the work, all the time, and we've still to reach outside the net. We haven't made any money (except a little that we've used to pay rehearsal room rent, some gear etc... No private money has been earned, ever), but that's ok, because we've had fun..
We have played in two countries except our own, and on top of that Machinae Supremacy gigs are rare. When we've contacted festivals and such they say "You don't have a label, that makes you a demo band... But our demo stage is full, sorry, call back when you have a label."
Now, we want to continue making music, and continue to stay close to our fans. But all the bullshit you encounter in the DIY realm is really getting tiresome. With a major label such as Spinefarm backing us up there's one major change that you, our fans, will notice... And that's gigs. We still feel and believe as we've done before, but we want to get out more and play more gigs and get our album in out in stores. Spinefarm is already looking into getting us a booking agency, which means people who's job it'll be to get gigs for us.
Now, we probably won't get any richer from this. Spinefarm will, undoubtedly, but we don't care about that. In fact we'll go from getting every penny of an album sold to getting practically zero. If you think having a major label makes someone rich, you're mistaken, trust me.
We chose to do this because the advantages outweight the disadvantages, and because it was a step we've not yet taken. We wouldn't have done this with any label, either. Spinefarm is, after all, Spinefarm.