According to Mormons, what is the benefit received from paying tithes and following the temple ceremonies? This is related to this other question regarding the Mormon view of the passage in Matthew 7:13-14. In this passage Jesus had said that majority of humankind would follow the road that "leadeth to destruction".

According to Mormons, "destruction" here means not attaining the blessings of the Celestial Kingdom (i.e. the highest level of the 3 heavens); instead, most of humankind will reach either the Telestial or Terrestial Kingdoms.

The question is, if most of humankind will reach some level of blessings (just not the highest level) by doing largely nothing for it, then what is the benefit of faithfully paying tithes and following the temple ceremonies?
Expanding on my comment of

who wants 2nd or 3rd place prize/reward when anyone can have the 1st place prize

The degrees of glory are described in 1 Corinthians 15:40-41

40 There are also celestial bodies, and bodies terrestrial: but the glory of the celestial is one, and the glory of the terrestrial is another.
41 There is one glory of the sun, and another glory of the moon, and another glory of the stars: for one star differeth from another star in glory.

Mormons belive the Celestial kingdom is like the sun, the Terrestrial is like the moon, and the Telestial is like the starts; as a comparison of glory. The Mormons believe that anyone can attain the Celestial Kingdom, which is the only kingdom where we (man) can continue to progress and where we can be in Heavenly Father's (God) and Jesus Christ's presence forever.
I want to answer this question by asking a question in return: Why wouldn't you want to receive all the blessings God has in store for you? God has given us everything and all he asks in return is 10% (tithing) in return and to keep His commandments which he will then bless us for keeping. Man has agency, so it is up to you what commandments to follow or not, and you will be rewarded for what commandments you keep.
See also
Kingdoms of Glory