Conference money arrives in three shapes — tickets, sponsorships, exhibitor fees — and usually through three systems. Here they are one event, at one capped rate, feeding one attendee list.

Open a tier, close it, cap it, or price it for members — the fee is 3% + 50¢ per ticket either way, and the 3% stops climbing at $39.
Sponsorships and exhibitor booths run through the same event at the same 3% + 50¢ per ticket, with the 3% capped at $39 per order — so a $5,000 sponsorship is not billed like 200 tickets.
Badges, sponsors, and the morning of day one.
Yes. Open and close tiers on your own schedule, cap how many of each are available, and attach promo codes for partners, speakers, or members.
Create your event, sell every ticket, and run every on-site sale from one platform.
You handle the event. Addmi handles the technology.