shaglio
The Prince of Dorkness
Not really a problem IMO, though I'll see how it balances. Giving it an era requirement doesn't make sense, and upping the levels doesn't work too well either, given you'd expect something from Level 1.
If you made it a % increase rather than a flat #, then you wouldn't get Tourism output until you normally would since x% of 0 is still 0. In other words, instead of it being, say, 1 Tourism for a Level 1 unit and 4 Tourism for a Level 4 unit, maybe have it be 10% Tourism for a Level 1 unit and 40% Tourism for a Level 4 unit. Or, if that's too much on the high end, maybe 10+2L% where L is the unit Level (Level 4 would then be 18%). That way, you wouldn't be gaining Tourism from virtually the start of the game.