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Sure, I think a lot of Wall Street investors have already bought some cheap cryptos. However, most of them probably haven't yet, due to the technicalities of buying, storing and taxing them. It might not be worth the hassle for a lot of them just yet. 

They probably were earlier this year. The drop from around $19000 USD probably scared off some of the larger speculators who were on the fence.

I believe that wall streets are already buying cryptocurrencies at low price but not all of them are

buying it but i think it would be a great idea if they start buying it because it will be a good development for the

cryptocurrency market,but the way the cryptocurrency market works might be what is scaring some of the

people from wall streets because the market features might be what is discouraging some of them...

It depends what you mean with Wall street. 

By law public investment funds are not allowed to invest into cryptocurrency. This is because the fund needs a guarantee by the clearinghouse they can't lose their investments. That's why a cryptocurrency etf will be bullish, a lot of institutional money can't enter this sector at this point in time.  

People who work on wallstreet can however buy cryptocurrency privately, not as an institutional. There have been instances where this has been the case.  For example in April this year George Soros gave a member of his family office approval to trade cryptocurrencies. 

no, if they would buy then the cryptos will skyrocket.