Because iptv is not hd. it shows 720 but it is really closer to 420. if you have a key board, hit the letter o, and you can see all kinds of useful info. IKS has a far better picture quality, but IKS is going the way of the DODO.
I have been IKS since they were $40 a year and will be very sad to see it go.
Problem is the guys who do IKS have switched to IPTV and IKS has suffered from it as you well know.
IPTV is cheaper and easier for the backend people and they stand to make a lot more money from it.
Use IKS while you can. I may have 5-10 HD channels at the moment, but it changes daily. Every ECM takes longer and longer to come back from, and there are less and less people working on it anymore. One day it will go down, and just not ever come back up.
Hopefully they will get the IPTV working by then. The only issue is bandwidth and not near enough to go around from there end.