Blacklist giveaways based on their worth?

Not really. He was looking for a solutions thats more durable than this: one click on any link and your parameters are gone and must be entered manually again.

+1

indeed it does !
There are often puzzle games not worth much but very enjoyable !

In fairness, that's a game based on extremely minimalistic gameplay, with appeal based around its achievements.
Those are the kind of games most of us are trying to filter out, so it's not a good counter-example, regardless of personal desirability.
(Of course, given some of the games I play, I'm certainly not one to talk about desiring games of dubious or niche appeal. :P)

Other than Interloper, I can't think of any well-received $1 retail games that are considered to have meaningful gameplay content. (In fact, most $1 games with with even passable review scores are based around either troll reviews or people being dismissive of money, stating "well, it was only $1, I wasn't expecting anything anyway.")
Rather, the main issue is that SG filters skip over DLCs, and some of those are just $1 for actual content. I'm also not sure about the "under 5p" qualifier, as there are several well-received games starting at about $3 retail (and that's just scratching the surface of decent games under $5).

The best approach, for those not wanting to obsessively hide games, is presumably to alternate between the Wishlisted filter and the >5 filter. Between those, and keeping an eye out on bundle threads for new low-price games of interest, everything should be reasonably well covered.

Meanwhile, the rest of us will keep aiming toward 20,000 or 30,000 hidden entries. :P

11,556 - You are winning

I thought I was doing well, just got to 10,000!

View attached image.