Business Visa - B1

Interview scheduled at 10.30 am, i was there at before one hour

Everything went well the process inside the consulate.

Finally, got my counter number 16 i was standing near the counter and before me there was a two persons, one was being interviewed and other was waiting. Both of the guys visa got rejected

Its my turn, she called me through hand sign

i went and in the mean while she scanned my passport as i have been handed over to security lady and she have been passed to here while am in the queue.

Me: Good Morning with slight smile
VO: No reply from her
VO: Whats your purpose of visit
Me: To attend "XYZ: summit being organized by x company
VO: You work for this company?
Me: No, i contribute for that company
VO:How long you will be travelling.
Me: Its been for 7 days
VO:Have you ever been to US?
Me: No
VO:Did you marry?
Me: NO
VO: Whats your salary per annum?
Me: its xxxxx (my package is bit low)

she said sorry and gave me 214(b) form i was shocked for a moment.

But the company which i have invited was sponsoring me everything i mentioned same in Ds160,
she didnt even asked me a single paper from me and even i tried to give her docs while in middle of interview she closed the lid, dont know whyt.

Does really my salary is a negative point for this though everything covered by X company and i have everything (flight, hotel) booked.

Guys, i am planning to reapply as this summit is too important for me to apply.

Please provide your valuable suggestions which can help a a lot.

if i am applying for the same location or any other locations

what can be the expected questions and answers to it.

Thanks in advance.