[sierdolij]

It depends.

The odds against an eBook store:

0. Undefensible business model - little/no barrier to entry, few patents, anyone can start such a store

1. Getting advertising and distribution at scale

On the plus side:

2. It might work at a tiny scale for niche categories/communities/local businesses.

Otherwise, I wouldn't waste too much time on it. I would something that's more difficult to copy or emulate.