It often costs less money and time to buy Coin Packs than it does to buy the same quantities of coins on exchanges, and even though sometimes you could be paying higher prices, this is an instant purchase with no time wasted placing orders or buying and transferring the coins to the platform. Coin Packs buyers also quickly start earning rewards, and when you take into account fees on an exchange and the time spent buying, sending and waiting for funds to arrive, it's easy to see the advantages of buying coin packs.
Something else very important to note is that when a project is selling Coin Packs, they are doing a service to their community and investors by not selling on the exchanges and taking away liquidity for others.
When you buy Coin Packs, you are supporting projects directly to help with development, marketing, listings and other costs.