The fact that the Blue Note sucks might be part of the answer. The prices are astronomical, the food is as bad as it gets, and they pack patrons in like sardines. On top of that it's a relatively large club. I can assure you Silver would sell out the Vanguard easily for a 2-week run.
Next time Silver plays the Blue Note the cover is $35. Add to that a minimum, tax & tip, and you're talking at least $50 for maybe 75 minutes of music. I can't do that too often.
Yeah, he's there the end of April. The price is $35 plus the cover. You know you'll be elbow to elbow when you're in the club.