Id say yes, but put a little more in it, 18 warriors 3 blister/blasters, 3 hoppers, and a tanker, charge a reasonable pricepoint and your there.)
For an army box to sell it needs a wow, the tanker is your wow.
Another idea would be a warrior swarm set, say 20plus warriors and some plastic terrain, lets say, a pair of bug holes and tunneling markers. It would make a good starter for a beginner.