Rather than all these, you must understand it is just gambling and if you cannot have the mind that there is possibility of losing, it is better not to gamble at all.
He is only asking you to join him with his bet if you care, while he gives some tips on his bet, so in that way, I do not see that as any problem, and the choice is all yours.
or tipsters that do much better than on this one. No one is being forced to bet up same as being said so trust wont really be an issue since it would just matter on ones choice.
Long run if you flip coins too many times having the edge against you - you are destined to lose.