I think they purposely avoid putting a "Buy" link on their product page because they want to get people started before revealing that the software costs money (and a lot of money for a password safe).
IMO it's not far off the equivalent of how tourist trap restaurants in Europe put out bread on the table (something provided for free in many restaurants) and then charge you if you touch any. FWIW, that's considered pretty slimy behaviour.
I've used 1Password for years, and password access in Safari on iOS has indeed been a pain point, but still been manageable. iOS 8 will make it much nicer, with the 1Password extension.
The only thing holding me back has been not having great mobile access (as far as I can tell) on Safari on iOS. Looks like iOS 8 will change that.
[1] https://agilebits.com/store