It's not the vendors... look...
We can agree on this.
The supply of bitcoins is fixed. Some portion of all the coins created up until this point are for sale.
The demand for bitcoins is growing. With all of the recent news about Bitcoin, many new people have been finding out about it and wanting to buy bitcoins.
Steady supply + increasing demand = rise in prices
If as ceiling ask is place by an earlier adopter there are no "rising prices" so what you get is:
Steady supply + stagnant demand = stagnant or falling prices
No one is digging through that 5000 btc blocking ask any time soon. You keep dwelling on this evidence and I keep pointing you to the charts.