Once you've purchased a software program and had some help in learning how to use it, there should be no need for 'support' so it goes without saying that there should be no support fees.
Try telling that to greedy software vendors who are out to get as much of your store's income as you will allow. Once you've gotten into a software that charges monthly or annual support fees, the software will stop working if you don't pay up, and you can bet, based upon historical data, that the fee will increase as time goes on because you're locked in! No, you won't be inclined to switch to and learn another program, and go through the whole thing again, so learn the lesson now:
What's that for? It's for knowing that when you do call for help, the phone will be answered. Every software vendor has the ongoing expense of keeping the software current with changes in technology and because we are already giving the farm away on up-front cost and saving you a ton on 'no monthly fees', we can't also shoulder the cost of maintaining the software for our users' beneift. Meet us half way ;;