Many realtors do not enter the MLS listing information themselves, so they are not solely responsible for typos. Errors happen, and they are corrected quickly when spotted. It is also up to the seller to check the listing info. for errors as well.
Real estate does not work the same way as retail. If there is an error in a store ad, the store manager will usually make a price adjustment to satisfy a customer. In real estate, the agent or brokerage does not own the property. The sellers must agree to the offer that is presented in order for the house to be sold. If you offer $14, 490 for a house that should be listed for $144, 900, the sellers do not legally have to accept your offer. They are not bound to anyone with whom they are not under contract, and they will probably be offended. In fact, even if you offer list price or over, but the terms are unfavorable, they do not have to accept your offer.
I am an honest, hard-working agent, and I have chosen my occupation to help people and to make a living at the same time. Most of us are not rich. We have families, and we work hard just like anyone else out there. I do not spend my time thinking of ways to cash in at the expense of others, and I am somewhat surprised that anyone else would have the time and energy to spend doing just that.