What is the purpose of collecting buildings?
Just for aesthetics. There is no benefit, gamewise.
The higher the tier level of your buildings and monuments, the more TB rewards and green prize rewards you will get to help with your game (Party passes, gems, coins, charms)
In doing so, many use these collected and evolved buildings to make their own little city design as well as increase their daily city rewards. The smaller buildings give little to your city (but not zero) and are more for the look than the reward ability.
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Buildings also generate income with coins. This adds to your coin total helping you advance your milestone or crown levels.
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