Dealers constantly bidding in auctions are:
1. Artificially inflating the prices
2. Demotivating and frustrating collectors
3. Making it impossible to estimate prices real collectors would be willing to pay
If dealers would offer fair prices, more collectors would sell to them or consign in their eshops. But no, they would prefer to offer peanuts but then pay 3 times more for the same coin when it gets in auction.
And Shanna Berk is distorting the market and annoying everyone - except perhaps for her client.