Subscription Options Unreasonable

I have a free subscription and as part of it, I get to read only 15 articles.  I can understand a limit but 15 seems very low.  I would pay to read more articles but the only upgrade above the free membership cost $15/month and has a lot of things that I will not use or need as I only want to read more articles.  My suggestion is to offer another membership for something like $5/month for the same benefits as a free membership except unlimited or maybe 100 articles.