Question on chopmarked trade dollars

I'm interested in starting a set of chopmarked trade dollars. Do chopmarks lower the price, if so how much? Also is there a limit to how many chopmarks a TD can have before its considered "uncollectable"?
P.S.
P.S.

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Comments
certain Chinese characters representing specific merchants.
Brian.
I've seen a couple of Mint State pieces with chop marks. One had a mark that was well hidden, and it had only a minor affect on the price. If the marks of obvious, however, the price and marketability go way down.
Buy chop marked trade dollars for the love of them, NOT as any kind of investment or store of value.
EVP
How does one get a hater to stop hating?
I can be reached at evillageprowler@gmail.com
ebay is a decent place to find chopped dollars - but as usual you must beware. I've seen some chopped coins that I felt were not genuine. For instance, there are three 1873 chops on ebay right now and a couple of them have very unusual reeding.
ebay trade dollar