Pricing is a super tricky issue, especially when its for something related to financials. I think there are plenty of people who wouldn't bat an eye at $14p/m (and maybe they are the target audience), but there are also plenty of people who aren't buying $14 cocktails.
I fall into the camp where I like to play around with spreadsheets (free -£time) or other online calculators (free) just to make loose projections and see where I'm at. I make a good salary (for the UK) but don't pay for any financial advice (and probably wouldn't unless my situation got really complicated). I think if it was priced at £30-50 a year or £4-5p/m I (personally) might go for premium because the tool is honestly really great!
One completely different avenue you might consider is to selling direct to companies to provide to this a service to their employees. I'm not talking financial companies, but more as part of the benefit package. My company added something to their benefits, called bippit - which is awful (or at least not useful to me), but provides virtual one-one financial advisors and some very basic online tools.