Those are fun, but they don't work for most sites anymore since pretty much every site has started using https and browsers automatically upgrade to https if it's available.
In theory yes, you have to remember though that you have to enforce parents yourself. If you suspect infringement you will have to sue and carry the lawyer costs, at least until a court judges in your favor. This is off course besides the costs of applying for the parent itself. Your patent might also not be valid in all countries.
In practice the chances of a private person doing this and winning against a multi-billion dollar corporation without going bankrupt are negligible.
The money they earn is income, not pure profit. The business usually has other expenses that have to be covered. In that case 25% is usually not a bad deal.
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