...and to be honest I'm happy because my neighbors invest in bitcoin just like me...
Actually, the seller in the store acted recklessly, trusting your advice, obviously not understanding the fact that you yourself are new to investing. You should understand that if the price of bitcoin decreases after your recommendation to invest in bitcoin, then you will have to shop in another store, as the seller will consider you to blame for his losses.
That could be the possible scenario once the seller started to endure losses. But I doubt if he will invest immediately without studying about bitcoin on his own self, as every investment needs prior preparation and deep research before you finally decide to put your money at a risky investment. Also, the buyer must also realize that he has been very quick in giving information to the seller, not realizing that hes still a newbie and he has to learn more before he can be reliable enough to share the facts about bitcoin.