~snip~
I do subscriptions from 6 months, 1 year, and 2 years
I think you should definitely offer 1 and 3 month subscription options, because real insight into how well/bad things work is hard to come by after a 12/24 hour test. Also, from personal experience, you should pay great attention to the choice of IPTV player, because the best list on the best device can work very poorly if the player is bad.
What I want to say is that everyone who sells such lists should invest some time and find the players that work best - at the same time it should be taken into account that paid IPTV players are still far better than free ones.