I can't speak for POTV's stats obviously, but if our data is anything to go by then alienating mobile users would account for a significant lack of activity - desktop accounts for about 45% of our web traffic.
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What are the current rules regarding vendors that have won? Are they ever allowed to be nominated again? Are they allowed the following year? Perhaps some kind of cooldown period would be a good idea (3 month / 6 month etc.) so that good service can continue to be celebrated without the same company winning month on month?
Can your system distinguish between desktop users and mobile users who choose to use desktop view when browsing sites?
Sadly, July winners can never ever ever compete again ...