Blocktrades.us Charge so High Fees compare to bittrex or poloniex giving proof

I was having 0.035 Btc in my account when i clicked on buy from direct link THis shit Happen WHen steem dollar price is equal to 85 cent i put an buy Order on Blocktrades.us Since steem called it unofficial website but why they include it They charge too high compare to poloniex Or bittrex Only one benefit i can found deposit is instant

Now i am going to show screenshot taken from poloniex Where blocktrades.us Give me 128 dollar for 0.035 Btc poloniex Gives me 176 DOllars so Far difference among both of website i am quite surprised from This situation Whats going On there .
Here is proof

SO i want to report this issue to steem community to Find a better solution going to tag Some steem officials Hive account@teamsteem Hive account@steemboard Hive account@blocktrades Waiting for Their Answer why Price difference too high ??