Is 30 subscribers in 5 days good?

[Lane]

I just made a YouTube account with only one video

[Palladini]

Not really.

[Ari]

I think it is a good start for one video and 30 subscribers in 5 days. From now on you have to do your channel promotion.

As you already got 30 subscribers to their channel watch videos and leave comments. You may be thinking why? because when people will watch video and read your comments there is a chance they might come to your channel. So, they might watch a video which is good or they may subscribe to you.

Just want to give you some help though you did not ask. As per Google (Youtube) Help.
But how to promote video?

How do I promote my videos?

Cross-promote your videos

Publicize your videos and your channel on the radio, TV, websites, forums, newsletters, other social networking platforms. Link your YouTube channel in as many places as you can: websites, blogs, magazines.
Use our YouTube APIs to create YouTube badges for your website that display your YouTube presence and link to your YouTube channel.
Allow embedding so others can distribute for you. Use the embed URL that comes with each video to embed your videos on your website. Send the links to blogs which may want to display your content.
If your videos are product reviews, include as much of the following information as possible as video tags: UPC, EAN, ISBN, MPN, model number, and brand. Example: For the ReadyNAS Duo, add, "UPC: 0606449056822, MPN: RND2150-100NAS, Brand: NetGear" as tags.

Audience Engagement

Don't Be Shy: Speak directly to YT community and ask them to subscribe!
Use Video Descriptions and Banners to encourage users to Rate, Subscribeand post Video Responses.
Enable Comments on Video Pages (you can always delete comments or block users).
Use Playlists to group your content by theme – this makes it easier for users to find videos on your channel.
Engage your audience through shoutouts, comments, subscriptions, and by asking questions or soliciting ideas.
Encourage Contests. Use eye-catching titles.

YouTube Promoted Videos

YouTube Promoted Videos allows any video uploader to surface their video content on YouTube by targeting users that are interested in seeing their content.
You can find out more about YouTube Promoted Videos in the Ads section of the Help Center.
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Hope answer will be helpful to you. Wish you success.

[John Z Wetmore]

It's not bad for a new channel with only one video.

Try to post new videos on a regular basis so your subscribers will have a reason to come back.

[James]

I say it is but on the flipside ive hard my channel for 3 months and 34 videos and only 16 subs