Fortunately, I am not affiliated with your company, so I can afford to be a bit more blunt:
One can spend a lot of time on testing. Time is very valuable. If one's time is worth $45 an hour and you spend more than one lousy extra hour per month to save the cost of this service it is probably a mistake.
Too many services price themselves by telling amateurs what they want to hear instead of charging for the value provided to professionals.
That means professionals from related web industries, enthusiasts and "amateurs" may require a service like Mogotest, but not with the frequency of professional website designers, or at the current, one-size-fits-all subscription price. Just sayin.
A little background on me. Over the past dozen years I've developed hundreds of websites, and I still wouldn't consider myself a "professional website designer". Website design isn't where my expertise or passion lie.
So yeah, nirvdrum, maybe I'm not your market. That's cool.
I wish you luck with Mogotest!