One of the hardest decisions we have to make with our creations is how to get paid. It is true that we love our creations and they are a part of us, but there should always be some sort of reimbursement for our effort.
Some of the most common patterns for monetization in games are paid, paid with trial, ad-supported, in-app purchase, and in-game currency.
Games are usually sold at a fixed price. For big game studios, this is generally the only option, especially with disk-based delivery and some marketplaces.
The emphasis on a paid-only pattern means that you need a high-quality sales portfolio for your game and outstanding game-marketing assets (logos, screenshots, videos, and so on).
What is also just as important is the blurb about your game. It really has to stand out and draw the player in to make them part with their hard-earned cash.