While that's true, advertising isn't valuable unless the advertisers know something about you. And subjecting my personal bookmarks to data analysis isn't a line I'd be willing to cross. Once you use it for a few years, your thousands of bookmarks reveal quite a lot about you.

Back when I was using Del.ic.ous a lot I was in college and really bored I stalked a few people on Del.ic.ous just to see what data I could gather. The first person that followed me I decided to look into. They posted a link to their grandmothers obituary and from there I was able to get their real name and where they were from.. And pretty much knowing everything about their location to where they applied for jobs was easy.

You're not the potential client then, everything is OK. He can run his business how he likes it, and that includes his decision not to target the maximum possible number of free users.

You are right, I'm not the potential client but damn I would like to use this. I'm lucky only a minimal part of all web services use this pricing system.

> There's a huge psychological barrier when buying things like this one. Even if it costed $0.99.

> damn I would like to use this.

It seems then the barrier isn't actually psychological? Do you live in the country which makes the electronic payments impossible? Is it really expensive for you to pay for some service you like only once?