You get more concurrent sessions, which is good, but that's a lot more expense and you could buy multiple SC licenses for the same money.
One of the biggest benefits of doing remote support is being able to support several customers at the same time.
Want to double or triple your hourly earnings? Concurrent sessions is how you do that. Want to patch several servers at the same time? Same thing.
I think concurrent is so vital to remote support that even Instant Housecall's Free Edition includes concurrent... for free.
IHC is good software, I'm not knocking it but, for the OP's concern about cost, it is not your most cost-effective route.
One year free is pretty cost-effective. If OP earns enough after his first year (or month

), he'll be able to afford it without batting an eyelash. If not, he probably doesn't have much of a business.
A single session pays for a whole month with profit left over. Run two or three concurrently, and you're golden.
I'm glad that you have a service that suits your needs at a price that you can afford. I'm also glad that there are other folks who appreciate what we offer, and some of the unmatched features like remote hardware repair, time-window, PC repair automation, end-of-session surveys, and branding. This, and turn-key and fully managed solution, let you focus on your business and I'm thankful that our customers enjoy it.
IHC is $499/year with 3 concurrent, whereas if you bought a second licence for SC you'd wind up paying $600.
Actually ScreenConnect would be $900 for 3 concurrent plus a bunch of other costs, but who's counting. If you get the Technibble business kit from Bryce, Instant Housecall is $399/yr. I know that doesn't include unlimited unattended but it does include unlimited on-demand plus time-window. That suits the needs for
a lot of folks out there. For those who need more we offer other packages.
This sucks. The 1 year trial is only available for 8.1. I only have 8.0.
Wish I could help you there. We wanted to release on Day 1 of Windows 8, but the OS had too many bugs for me to be able to release it in good conscience. So we waited to ensure that our customers saw the modern app at its best. Microsoft graciously fixed every bug we identified except two (and I have to give them a big shout-out for their fantastic service and support -- it really was amazing) in 8.1, but they declined to put out a hotfix for Windows 8.
Anyway, to answer OP's question, if you're tight on cash and Instant Housecall Free Edition doesn't suit your needs because it needs 8.1, and you don't mind putting in a bit of elbow grease in and asking your customers to do the hokey-pokey when the browser or AV balk at your unsigned code or "not commonly downloaded" messages, you can get UltraVNC at uvnc.com.