Why Aren't Jehovah's Witness Wedding As Fancy As Other Churches?

Could it be because the outward display is less important than the actual wedding,a man and a woman become husband and wife?

Jehovah's Witnesses focus more on the marriage than the wedding. True, weddings are a happy and joyous occasion to be celebrated, but we really strive not to be extravagant. The wedding is one day but the marriage lasts a lifetime, or at least it is supposed to…so that is where the focus is. Also, we are taught not to display "one's showy means of life", we strive for modesty, balance, and humility.

Besides, being separate from the world.
Not being showy in display.
As Sherry B said.
I would think it always has to do
with the type of wedding a couple wants….no?
Isn't that how it goes with weddings? yes?

Most of us put more emphasis on the marriage than the wedding itself.

Rice throwing is no longer allowed because it kills birds…that is all I know
Rice becomes huge in their belly and they can not pass it

Mine was VERY fancy! My wife's dad is a multi-millionaire and so no expense was spared. The Kingdom Hall was not big enough to hold all of the guests so we got married at the Forster Mansion in beautiful San Juan Capistrano. We didn't want anyone to have to drive home in a DUI situation so dad hired a car service to drive people from the mansion to their homes after the reception.
We drank 82 bottles of champagne and I dunno HOW many bottles of booze were emptied at the bar, but everyone got pretty toasted!
The throwing of rice was considered, but her dad tossed the idea out because it is a pagan custom. He said it symbolizes fertility and rice made to look like wads of sperm flying thru the air is inapropriate for a witness wedding.
We were taken by limo to our honeymoon suite and then to the airport where we honeymooned for two weeks on the Hawaiian Islands. Our wedding is not the typical JW wedding, but everyone sure came and had fun anyway.

Throwing rice on the bride and groom is like a pagan superstition that was like sympathetic magic, meant to make the bride and groom "fertile". Jehovah's Witnesses don't practice such silly superstitions.
Regarding the modesty of our wedding celebrations? The Bible condemns people who are so determined to make a "showy display" of their "means of life".
1John 2: 15 Do not be loving either the world or the things in the world. If anyone loves the world, the love of the Father is not in him; 16 because everything in the world—the desire of the flesh and the desire of the eyes and the showy display of one’s means of life—does not originate with the Father, but originates with the world. 17 Furthermore, the world is passing away and so is its desire, but he that does the will of God remains forever.
We try and keep the holiness and the spiritual importance of the occasion at the top of our list of what is important, and the material is lower down. Our weddings are always joyous and filled with happy people who love one another. Old friends who all know each other or know someone who knows someone etc. We are like a big extended family. And sometimes others in our congregations will assist and help with the weddings, but we aren't all about showing off, we are much more concerned with Jehovah's glory than with the bride's or the groom's.
I've been to non-witness weddings. They are COLD by comparison to ours. At least that is what I saw. We also don't have a lot of "bridzillas" in our congregations. The bride is NOT the most important person in our wedding ceremonies. Our God is.