Please try to read and don't ruin this thread with off-topic comments. If you read carefully and then play WoT, you will notice the pattern yourselves. What is seen cannot be unseen. Net protecting it's intellectual property mentioned in the patent and being used in World Of Tanks. But that raised the question: Can it's content put some light on current game mechanics?
Matchmaking mechanism explained - General Discussion - Official Forum - World of Tanks Console
First daily victory with the vehicle Coefficient of 2 No Exiting battle during loading screen or countdown No "Joining a battle" bonus. Since your tank is actually present in the battle until it gets destroyed, it can passively earn XP e. No "Joining a battle" bonus. Since your tank is actually present in the battle until it gets destroyed, it can passively earn credits e.
US8425330B1 - Dynamic battle session matchmaking in a multiplayer game - Google Patents
A video game such as a vehicle-based combat game may include multiple types of vehicles, where each type of vehicle may progress through increasing tier levels. Different types of vehicles within the same tier may have different capabilities, strengths, and weaknesses. When performing matchmaking for a game session, a matchmaking server may use a battle level table defining permissible tiers of each type of vehicle allowed within a particular battle level, and may also limit the number of a specific type of vehicle allowed in any one game session. The battle table may provide an advantage to premium vehicles by limiting the tiers of other vehicles against which a similarly tiered premium vehicle may compete. Battle level difficulty may be adjusted by adjusting the ranges of permissible vehicles in each battle level.
A similar investigation and exposing has been made on several titles utilizing a similar microtransaction model. Most long-term players can't deny the obvious drastic change in matchmaking when queueing with a newly purchased premium vehicle that was on a major holiday sale. For example, the Chrysler K GF where many reviewers got censored by Wargaming for exposing the truth about their corrupt system.