Long years ago, probably 20 years ago, I promoted a low quality domain at Sedo.
It worked well. The domain was sold for around 1,000 euro to a European person. He made an offer in Euro (Euro was a new thing) and I countered in Euro. He accepted my counter offer and paid. I was not expecting he would accept and pay. The domain was PR4 or 5. Pagerank and some organic were the only good things with the domain. I would be very happy if it was sold for $300. For me it was a low quality domain. I bought it from expiring auction for less than $50 and few months later I sold it for around 1000 euro.
After my first promotion worked well, I paid for promotions for 10+ times but none of those worked. Since then I don't pay for promotions.