As a counter-point I will say that most of my freelancing clients are perfectly willing to pay that and more, for platforms where a cron that misbehaves has consequences.
I would suggest not to lower the prices :-)
EDIT: I prefer to pay more than $20/mo if this means that your product won't end up being stale and unmaintained.
The prices seem really reasonable and a steal if I was still in an enterprise environment. I'm not maintaining any prod servers right now, but $4.99 would be a sweet spot if I had a few hobby servers on the Internet that I was doing devops for.