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Scale as in the points value of the game. The more points the more firepower each army has and the easier it is for any particular individual unit to get blasted to pieces. Or for the damage output of any normal single unit to be less critical to the outcome of the game.
Bikes are considered good because of long movement range, better than average toughness, built in twin linked bolters, built in jink save option, relentless for grav weapons, and the fact that they are a strong option for mounting your HQ on.
That said, I would be hesitant to recommend a new player going all in on a full bike army before getting a bit of a feel for the game and figuring out your personal play style. Bikes are good, but they are just one of many decent units that can make up a decent army.
If you are starting with kill team and building up as you gain experience, I would consider getting some of the SM bread and butter units to go along with the units that get your imagination going. A Rhino, 5-10 Tactical Marines, maybe some Scouts, and a squad of bikes (or whatever it is that made you want to play Marines in the first place) would give you enough to make a few different kill teams. They are also the type of units you are sure to use at higher points levels, so you'll be as monetarily efficient as you can be.
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