Little Bird + C4 needs balancing

People are abusing the Little Bird/C4 combo. Buy a Little Bird, slap C4 on it, ram an enemy tank and it detonates. Instant tank kill. The problem is you basically get all your money back from the kill, plus extra, so there's almost no downside to suicide-running tanks. You can just keep doing it over and over. Funny the first couple times, but this is going to get old fast. 😂 There needs to be some kind of risk/cost attached to losing the heli like that.