I took a second look at the showroom:
The first showroom curators to sell their curation shares would in fact do so at a profit. The showroom has the potential to drastically increase the issue of frontrunning bots;
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Bots would no longer race to be the first to curate,
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Bots would instead race to unsignal after participating in the showroom - at a massive profit. They would also be able to hold off on participating in a showroom unless they see other curators participate as well.
Math:
(Using similar numbers to the example found in the docs). For simplicity I’m not counting curation tax. Curator | Graph Docs
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Two curators commit 240 000 GRT each to the showroom. (Total 480 000GRT) This would mint 4000 shares at an average share price of 120 GRT
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Per the suggested implementation, both curators get 2000 shares
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Since the bonding curve still is in place, the first curator to burn their 2000 shares would receive 360 000 GRT. The remaining 2000 shares would be valued at 120 000 GRT.