Linking to paywalled content

I had a brief discussion with Jon Slattery over the weekend about why his "quotes of the week" posts don't link to their sources.

His response:

The reason I didn't link was because I wasn't sure what to do with quotes behind paywalls.

But I think I will, where I can, link in future.

I was under the impression that this was a solved problem. The standard form seems to be to put a [£] or similar after the link. For example:

Why procrastination isn't all bad [£]

I think that makes is clear that the link is to paywalled content, while giving appropriate attribution to the source of your content. 

Seem fair?