I find them tacky and in poor taste. It is little more than begging or panhandling.
The word "tip" as used in this sense, is actually an acronym, standing for "To Insure Promptness."
In the beginning, it was slipped to the Maitre'd or the waiter IN ADVANCE of being seated..a form of a bribe to be sure your table was well taken care of. The current practice of tipping after the fact, and having it expected, with a "standardized" amount came about much, much later.
Personally, I resent the entire process becuase the wait staffs are grossly underpaid and must rely upon tips to make up the balance of their pay. It is not up to me to supplement their income; it is up to the employer to pay a living wage.
And no, it would NOT increase the price of "eat-out" food, because it's all the same in the end--whether the prices increase, or whether the customer is expected to dish out the difference after the meal--the end result is the same.
It would certainly take the angst out of the equation on both sides of the table. And if the service is poor, speak to the management. The threat of being fired is probably a better motivation than a few bucks shy on tips.