Your pricing model seems unconventional: I'd not cap at $50, let bigger companies pay your salaries. Also maybe consider letting small teams (e.g. 5) have a free plan.
A team of five people will be under the pro plan (4-10 collaborators) will cost $16/month for the whole team. This is 54 cents a day. So if you have 10 members in your team beside you (equals 11), the cost per person per day is less than a nickel.
Still not affordable?
Your pricing model seems unconventional: I'd not cap at $50, let bigger companies pay your salaries. Also maybe consider letting small teams (e.g. 5) have a free plan.