Struggling with pricing...

My app allows you to add websites to it to track.

Currently, I have a price for the first site and then a reduced price for each site after that E.g. $30 for the first site and then $10 for each additional site.

I'm wondering if packages might be better - for example, 5 sites, 20 sites and 50 sites...

The benefit here is someone with say 15 sites would be on the 20 site package; this, of course, could also be a negative.

I actually spoke to a customer the other week who currently has 9 sites added but they actually have around 20 - so again, a package might be more enticing.

I'm really not sure - Things like this, I feel are also hard to test i.e. different customers complaining about different pricing and offers on the site to what they are paying.

Reaching out for thoughts.

Thanks,
G