I just recently attended an open call for a model/talent convention...

...and have been selected to attend. I am pretty excited about this. The people who selected me told me they believed I have what it takes, and the agents would be really interested in seeing me. I am interested in your advice regarding attendance at this convention. They are asking for a lot of money to attend. Is it worth the money invested? Is this a good way to get into the modeling or acting business?
Model/talent conventions are a terrible way to try to get into the modeling or acting business. 
They are expensive and yield little of value. They are scams. They are scams because *MOST* (almost all) of the people who attend such events receive little of any real value for their money. A few workshops, a quick walk on a runway and a "chance" to be seen by "agents" is hardly worth the many hundreds - even thousands - of dollars these ridiculous model searches charge.
All legitimate modeling agencies hold open calls at their offices - at NO CHARGE!!! Just call the agencies and ask.
The people who organize model/talent searches are fully aware that over 95% of those who attend will not be "chosen". 

They are fully aware that of those who are "chosen", only a few might actually gain any significant work on any regular basis.
The people who organize these searches take in hundreds of thousands of dollars in fees. Almost all the people who attend receive little of any value toward a professional modeling or acting career.
Model/talent conventions are scams.
The information you provide to the "professional scout" (usually someone who knows little if anything about the modeling business) at the model/talent search "open call" was likely sold to modeling and acting schools, photographers or anyone else interested in selling services to naive but eager model/actor wannabees.
The "scouts" are trained to get as many people to pay to attend the search as possible - whether the attendees shows any merit or not. The scouts use a lot of flattery and misleading statements to accomplish this goal.
The agents who are at the search are paid a sizable fee to attend. Many of the "agents" are not really agents. They are agent assistants or other people who have no decision making authority and lack the ability to actually sign an attendee.
Often times, the staff of these searches and even the "agents" use the open calls and the search convention to find cute women and men to "date" (have sex with). This will not advance anyone's chances of launching a modeling career. It just makes fools out of the attendees.
The organizers usually require agents to "callback" a certain number of candidates, whether they are interested in all the candidates or not.
A callback does not mean you have been "choosen" or are on your way to a career. It simply means that the "agent" wants to talk to you again. Most attendees who are called back do not ultimately receive any representation.
There are far-far better, less costly and more productive ways to get into the modeling and acting business.
I suggest you head to the library or spend $20 or $30 at your local bookstore and get a book or two about the modeling and acting business so you can learn something about how things really work. It is far, far cheaper than wasting money on silly model/talent searches.
For more info about acting and the acting business, see this website:
http://www.redbirdstudio.com/AWOL/acting2.html