Re: Why there is no Standard Marketplace like Amazon with BTC as payment method??
1. is the problem in supply side? are sellers worried taking payments via BTC bcas of volatility
Yes! It is one of the major issues. Due to the high competition in the e-com market, all stores are forced to keep their profit margin lower. So it is very difficult to sustain a business with such a small profit market and huge price volatility.
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2. is there a logistically inefficiency, that smaller sellers can never compete with the likes of amazon
No! We have big players available in the logistics industry to help new businesses. They are even ready to provide discounted rate if you are just starting out. So logistics is not an issue whatsoever.
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3. is the transaction speed an issue for retail transactions?? major cards payments are done instantly (maybe this speed is needed for impulse purchases 
)
)Somewhat true! However, we have services like Bitpay, Polispay to overcome such issues. Even LN has already started functioning. So speed issues can be taken care. There is another one issue you have missed out - Crypto regulations. If we leave some countries like Japan or Germany or even US, majority of the countries don't have any regulations around crypto currencies. For majority of the countries, crypto is not even a legal form of money. That's what needs to be sorted out first if we really want to see a big marketplace in crypto market.