Cost of DW? PLEASE HELP!!

[La-am]

Hello!   I am trying to plan my destination wedding but do not know where to start! I have been reading thread upon thread and bog up blog to find out how much a DW might cost. I have gathered between 10,000 to 20,000 is sufficient which is exactly what my wedding budget is. However, as I am calling travel companies and looking at resort websites I am getting numbers like 800 PER PERSON for just the reception alone (just food and alcohol!).    Please please help me! Is my budget of 10 to 20 thousand reasonable for about 50 guests? Do I plan through a company or the resort?    My dream is to have a beach wedding which is perfect since I cannot afford one where I reside!   Thank you so much to anyone who will help and give any info.   Sincerely,   Desperate bride-to-be